Led device

• US 6,087,680 A
• Filed: 07/31/1998
• Issued: 07/11/2000
• Est. Priority Date: 01/31/1997
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Brunner, Herbert, Spath, Werner, Gramann, Wolfgang, Waitl, Gunther
• Primary Examiner(s): Guay, John
• Application Number:
  US09/127,529
• Time in Patent Office: 711 Days
• Field of Search: 257/88-91, 257/93, 257/99, 345/82, 345/83, 313/500, 438/28
• US Class Current: 257/91
• CPC Class Codes: H01L 2224/73253 Bump and layer connectors
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 27/156 two-dimensional arrays
• CPC Class Codes: H01L 2924/09701 Low temperature co-fired ceramic [LTCC]
• CPC Class Codes: H01L 33/40 Materials therefor
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]

Abstract

An LED device includes at least one LED chip having a front contact metallization disposed on a light exit surface of a light-emitting member and a rear contact metallization disposed on a side of the light-emitting member opposite the light exit surface. The LED chip is disposed between first and second conductor track supports. The first conductor track support is transparent and has at least one first electric conductor contacting the front contact metallization. The second conductor track support has at least one second electric conductor contacting the rear contact metallization. The LED device has, inter alia, the special advantage of permitting the size of the LED chips to be reduced, in contrast with the chip size in conventional LED devices, thus allowing the luminous spot density to be increased.

Claims

1. An LED device, comprising:

at least one LED chip having a light-emitting member with a light exit surface and a side opposite said light exit surface, a front contact metallization disposed on said light exit surface, and a rear contact metallization disposed on said side opposite said light exit surface;

first and second conductor track supports between which said LED chip is disposed, said first conductor track support being transparent and having at least one first electric conductor contacting said front contact metallization, and said second conductor track support having at least one second electric conductor contacting said rear contact metallization; and

said at least one first electric conductor having a plurality of mutually spaced-apart conductor tracks on said first conductor track support.

2. The LED device according to claim 1, wherein said front contact metallization has several mutually spaced-apart contact metallization strips.

3. The LED device according to claim 1, wherein

at least one of said conductor track supports is produced from an elastic foil.

4. The LED device according to claim 2, wherein said mutually spaced-apart contact metallization strips each cross said conductor tracks of said first electric conductor associated with said front contact metallization.

5. The LED device according to claim 1, including an optical coupling medium filling a free interspace between said light exit surface of said LED chip and said first conductor track support.

22. The LED device according to claim 1, wherein said first and second conductor track supports are formed of materials having a similar coefficient of thermal expansion.

23. The LED device according to claim 1, wherein said first conductor track support is produced from an elastic material.

24. The LED device according to claim 1, wherein said second conductor track support is produced from an elastic material.

25. The LED device according to claim 1, wherein said at least one second conductor is capable of at least one of elastic and plastic deformation.

26. The LED device according to claim 1, including an elastically or plastically deformable electrically conducting connector connecting said at least one second electric conductor to said associated rear contact metallization.

32. The LED device according to claim 3, wherein at least one of said conductor track supports is produced from an elastic foil made of plastic.

6. An LED device, comprising:

a plurality of LED chips each having a light-emitting member with a light exit surface and a side opposite said light exit surface, a front contact metallization disposed on said light exit surface, and a rear contact metallization disposed on said side opposite said light exit surface;

first and second conductor track supports between which said LED chip is disposed, said first conductor track support being transparent and having a plurality of first electric conductors thereon contacting said front contact metallization, and said second conductor track support having a plurality of second electric conductors thereon contacting said rear contact metallization;

said LED chips disposed between said first and second conductor track supports;

said first electric conductors each contacting said front contact metallization of at least one of said LED chips; and

said second electric conductors each contacting said rear contact metallization of at least one of said LED chips.

7. The LED device according to claim 6, wherein said LED chips are disposed in rows and columns, said front contact metallizations of said LED chips of each column are each interconnected in an electrically conducting manner by said first electric conductors, and said rear contact metallizations of said LED chips of each row are each interconnected in an electrically conducting manner by said second electric conductors.

8. The LED device according to claim 6, wherein said second conductor track support has a plurality of support beams mutually spaced apart and disposed next to one another and metallization coatings applied as said second electric conductors.

9. The LED device according to claim 6, wherein said second conductor track support has a plurality of support beams mutually spaced apart, disposed next to one another and at least partially including electrically conducting material.

10. The LED device according to claim 7, wherein said second conductor track support has a plurality of support beams mutually spaced apart and disposed next to one another and metallization coatings applied as said second electric conductors.

11. The LED device according to claim 7, wherein said second conductor track support has a plurality of support beams mutually spaced apart, disposed next to one another and at least partially including electrically conducting material.

12. The LED device according to claim 8, wherein each of said second electric conductors is applied to a separate support beam.

13. The LED device according to claim 9, wherein each of said second electric conductors is applied to a separate support beam.

14. The LED device according to claim 10, wherein each of said second electric conductors is applied to a separate support beam.

15. The LED device according to claim 11, wherein each of said second electric conductors is applied to a separate support beam.

16. The LED device according to claim 8, wherein each of said second electric conductors is a separate support beam.

17. The LED device according to claim 9, wherein each of said second electric conductors is a separate support beam.

18. The LED device according to claim 10, wherein each of said second electric conductors is a separate support beam.

19. The LED device according to claim 11, wherein each of said second electric conductors is a separate support beam.

20. The LED device according to claim 6, wherein said second conductor track support has an electrically insulating plate on which all of said second electric conductors are disposed.

21. The LED device according to claim 7, wherein said second conductor track support has an electrically insulating plate on which all of said second electric conductors are disposed.

27. The LED device according to claim 6, wherein said first conductor track support is produced from an elastic material.

28. The LED device according to claim 6, wherein said second conductor track support is produced from an elastic material.

29. The LED device according to claim 6, wherein said at least one second conductor is capable of at least one of elastic and plastic deformation.

30. The LED device according to claim 6, including an elastically or plastically deformable electrically conducting connector connecting said at least one second electric conductor to said associated rear contact metallization.

31. The LED device according to claim 6, wherein at least one of said conductor track supports is produced from an elastic foil.

33. The LED device according to claim 31, wherein at least one of said conductor track supports is produced from an elastic foil made of plastic.